Re: [avr-gcc-list] Optimisation help

[Wouter van Gulik]

Magnus Johansson schreef:
> I totally get the second and third reads. But the first one, just moving 
>  r24 to r17 will only work if r24 is only 0x00 or 0x01 not otherwise...?
>
> What should I do?

Well I can't see all assembler so this is a bit of a guess. GCC is 
probably going to do a conditional load. Since result/r17 could be 
loaded after the first call it will do so. So it will probably generate 
a clr and conditional ldi r17, 1 or something alike.

It would help if you provide all of the assembler between the first and 
the second call.

HTH

Wouter